/Engine/Plugins/Runtime/MeshModelingToolset/Source/ModelingComponents/Public/Scene/WorldRenderCapture.h
Compute a sphere where, if the camera is on the sphere pointed at the center, then the Visible Actors will be fully visible (ie a square capture will not have any clipping), for the given Field of View. SafetyBoundsScale multiplier is applied to the bounding box.
FSphere ComputeContainingRenderSphere ( float HorzFOVDegrees, float SafetyBoundsScale ) const